With the house having been wrapped up (at least siding and windows) the other day, I had a couple minutes of down time out in the shop, so I popped open the old electric motor that came with the small belt driven grinder I have.
View media item 35081
I blew out about 100 fly shells, some mouse turds, and all kinds of grassy stuff stuck in cobwebs. If I had tried to run it without cleaning inside I'm sure something would have caught fire. (I didnt have my camera with me at the time, so I didn't take pics of the guts).
I took parts to the wire wheel for a cleaning, sprayed wd40 into the guts to take off old grease, sanded off the rotor and stator, which had surface rust, and cleaned out the bushings. I re-oiled everything once I was happy and gave the contacts a light sanding to freshen the surfaces. Tossed it all back together and grabbed a 20" length of wire that I cut from some computer years ago (I know it sounds gross, but I keep an eye out on garbage day for large electronics, then cut as much cord off as possible to rewire old tools). I wired on the new plug and gave the motor a test spin.
View media item 41964
It's suuuuper buttery smooth and quiet when it's running. No vibration to speak of, and very little resistance. The wiring 'box' on the back had no cover, so I snipped one out of sheet steel to fit. I also packed the end of the bearing with grease, might make a cap to hold it in there.
View media item 41966
I ended up destroying the old pulley pulling it off, it was so rusty. I replaced it with a nice aluminum one from my great grandfather (I saved his collection of pulleys). This is a smaller pulley so the grinder will run a little slower, maybe if I find a stepped pulley I will toss that on.
View media item 41965
Gratuitous Spec Shot. Yes, it's upside down.
View media item 41967
Still have to clean the rust off the base and give the body a coat of paint, and wire in a switch, but good progress for now.
My only Issue with it so far is that when I plug it in, there is a pretty decent pop and blue flash at the back end of it on startup, then its fine. I'm figuring it's a poor or not quite tight enough connection in the centrifugal switch or starter contacts (much like points on an older car). These have sat for a few decades without use, so they may be a bit corroded, I haven't yet cleaned em. A piece of fine sandpaper folded backwards on itself and then pulled through the points might do the trick.
View media item 35081
I blew out about 100 fly shells, some mouse turds, and all kinds of grassy stuff stuck in cobwebs. If I had tried to run it without cleaning inside I'm sure something would have caught fire. (I didnt have my camera with me at the time, so I didn't take pics of the guts).
I took parts to the wire wheel for a cleaning, sprayed wd40 into the guts to take off old grease, sanded off the rotor and stator, which had surface rust, and cleaned out the bushings. I re-oiled everything once I was happy and gave the contacts a light sanding to freshen the surfaces. Tossed it all back together and grabbed a 20" length of wire that I cut from some computer years ago (I know it sounds gross, but I keep an eye out on garbage day for large electronics, then cut as much cord off as possible to rewire old tools). I wired on the new plug and gave the motor a test spin.
View media item 41964
It's suuuuper buttery smooth and quiet when it's running. No vibration to speak of, and very little resistance. The wiring 'box' on the back had no cover, so I snipped one out of sheet steel to fit. I also packed the end of the bearing with grease, might make a cap to hold it in there.
View media item 41966
I ended up destroying the old pulley pulling it off, it was so rusty. I replaced it with a nice aluminum one from my great grandfather (I saved his collection of pulleys). This is a smaller pulley so the grinder will run a little slower, maybe if I find a stepped pulley I will toss that on.
View media item 41965
Gratuitous Spec Shot. Yes, it's upside down.
View media item 41967
Still have to clean the rust off the base and give the body a coat of paint, and wire in a switch, but good progress for now.
My only Issue with it so far is that when I plug it in, there is a pretty decent pop and blue flash at the back end of it on startup, then its fine. I'm figuring it's a poor or not quite tight enough connection in the centrifugal switch or starter contacts (much like points on an older car). These have sat for a few decades without use, so they may be a bit corroded, I haven't yet cleaned em. A piece of fine sandpaper folded backwards on itself and then pulled through the points might do the trick.